<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>02-navigator.sendBeacon</title>
</head>

<body>


  <script>
    let res = navigator.sendBeacon('https://www.baidu.com')
    console.log(res)
  </script>
</body>

</html>